Brake shoe



V. BENDIX BRAKE SHOE May 29, 1928,.

FiId Aug. 24, 1925 INVENTOR VINCENT BENmx ATTORNEY Patented May p p ITED STA TES- PATENT. OFFICE.

vmcnm' nanmx, or CHICAGO, ILLINOIS,.ASSIGNOR m IBENDIX 1mm consent, or orucaeo, ILLINOIS, A conromrron or ILLInoIs.

BRAKE SHOE.

Application filed August 24, 1925. Serial No. 51,936.

This invention'relates to brake shoes, and is illustrated as embodied in shoes of pressed metal for a three-shoe type brake. An object of the invention is to provide a very strong but inexpensive 'shoe'utilizing abrasive material which may be molded and baked in blocks, or which may be molded in place in a channel formed in the shoe itself.

Having this object in mind, various features relate to forming a; channel for the.

abrasive material by side flanges on cylindrical flanges projecting from a central stiffening rib. Preferably "this rib is made by fastening together the flat arcuate web port'ions of a pair of stampings formed with the desired flanges.

These and other objects and features of the invention will be apparent from the fol:

lowing description of two illustrative embodiments shown in the accompanying drawing, in which:

Fig. 1 is a vertical section through the brake, just inside the wheel, showing the shoes in side elevation;

Fig. 2 is a section through one shoe on the line 2-2, Fig. 1, showingthe fastening of the abrasive material in the channel; and

Fig. 3 is a section, corresponding to Fig. 2. through a modified shoe, in which the abrasive material is held by' the side flanges.

The brake of Fig. 1 includes a drum 10,

i and a backingplate 12, inclosing a shoe 14 anchored at '16, a central shoe 18 anchored at 20, and a servo shoe 22 pivoted at 24 to shoe 18. The brake is applied by means such as a cam 26 against the resistance of return springs 28 and 30. Each of the shoes 14 and 22, which may be interchangeable, is

' forked at its end to form parallel arms straddling the end of shoe 18. Anchor 16 passes through a relatively large opening in shoe 18, and anchor 20 passes through relatively large openings in the parallel arms of shoe 14. In the form of Figs. 1 and 2, each sho is formed by fastening together a pair of stampings, the flat arcuate webs 32 of the stampings being fastened together to pro- 'Vlltl a central stiflening rib. If desired, there may be short reinforcing ribs 34 extending axially at the inner. edges of webs 32, white at the outer edges they extend away 'lrorn each 0 'er as cyiindricai flanges 36. K

t the outer edges of flanges 36 are paral is arranged a block 40 of suitable abrasive material. This block in the arrangement of Fig. 2 is held by threaded bushings-42 'in countersunk recesses 44 and engaged b threaded fastenings 46 passing througflanges 36, this construction bein specifically claimed in my cont-inning app ication No. 263,314g'fi1ed March 21,1928.

In the modification of Fig. 3, side flanges 138, corresponding to side flanges 38, are curved or bent inwardly to provide an undercut channel for the block 140 of abrasive material. If the block is made up and baked in advance, it is formed with grooves in its sides into which the flanges 138 may be spun. I prefer to form the flanges to shape in the first place, and to mold the abrasive lllfitQIiiflfln place as .a plastic, baking it afterwards. a

While two illustrative embodiments have been described in detail, it is not my inten tion to limit thescope of,the invention to that particular embodiment, or otherwise than by the terms of the appended claims.

I claim:

1; A brake shoe formed of pressed metal i formed with a central stiflening rib and with outwardly-extending cylindrical flanges on opposite sides of the rib, and with par-' and forming therewith a curve'd'channel,

and abrasive material fastened in said channel and projecting therefrom.

A brake shoe formed of two stampings, each arranged to provide a flat arcuate web with a cylindrical flange at the outer edge, the stampings being arranged. back to back with the websfastenedtogetlgmr and with the cylindrical flanges extending arisily in opposite directions, and with parallel side flanges on the outer edges of the cyiindrical flanges and forming therewith a curved channel and abrasive material fastened in said channel and projecting therefrom.

4. A brake shoe formed of two stampings, each generally channel-shaped in cross-section to provide a fiat'arcuate web with a projecting stiffening flange at the inner edge and with a cylindrical flange atthe outer edge, the stampings being, arranged back to back with the webs fastened together and,

with the cylindrical flanges extending axially in opposite directions, and with parallel side flanges on the outer edges of'the cylindrical flanges and forming therewith a curved channel, and abrasive material fastcned in said channel and projecting therefrom.

5. A brake shoe having a central stiflen- VINCENT BEN DIX. 

